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<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="API documentation for the Rust `load_textures` fn in crate `widgetry`."><meta name="keywords" content="rust, rustlang, rust-lang, load_textures"><title>widgetry::backend_glow::load_textures - Rust</title><link rel="stylesheet" type="text/css" href="../../normalize.css"><link rel="stylesheet" type="text/css" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../../light.css" id="themeStyle"><link rel="stylesheet" type="text/css" href="../../dark.css" disabled ><link rel="stylesheet" type="text/css" href="../../ayu.css" disabled ><script id="default-settings"></script><script src="../../storage.js"></script><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="icon" type="image/svg+xml" href="../../favicon.svg">
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<link rel="alternate icon" type="image/png" href="../../favicon-32x32.png"><style type="text/css">#crate-search{background-image:url("../../down-arrow.svg");}</style></head><body class="rustdoc fn"><!--[if lte IE 8]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="sidebar-menu">☰</div><a href='../../widgetry/index.html'><div class='logo-container rust-logo'><img src='../../rust-logo.png' alt='logo'></div></a><div class="sidebar-elems"><p class="location"><a href="../index.html">widgetry</a>::<wbr><a href="index.html">backend_glow</a></p><script>window.sidebarCurrent = {name: "load_textures", ty: "fn", relpath: ""};</script><script defer src="sidebar-items.js"></script></div></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!" aria-haspopup="menu"><img src="../../brush.svg" width="18" alt="Pick another theme!"></button><div id="theme-choices" role="menu"></div></div><script src="../../theme.js"></script><nav class="sub"><form class="search-form"><div class="search-container"><div><select id="crate-search"><option value="All crates">All crates</option></select><input class="search-input" name="search" disabled autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"></div><span class="help-button">?</span>
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<a id="settings-menu" href="../../settings.html"><img src="../../wheel.svg" width="18" alt="Change settings"></a></div></form></nav><section id="main" class="content"><h1 class="fqn"><span class="out-of-band"><span id="render-detail"><a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class="inner">−</span>]</a></span><a class="srclink" href="../../src/widgetry/backend_glow.rs.html#421-597" title="goto source code">[src]</a></span><span class="in-band">Function <a href="../index.html">widgetry</a>::<wbr><a href="index.html">backend_glow</a>::<wbr><a class="fn" href="">load_textures</a></span></h1><pre class="rust fn">pub fn load_textures(<br> gl: &Context, <br> image_bytes: <a class="struct" href="https://doc.rust-lang.org/nightly/alloc/vec/struct.Vec.html" title="struct alloc::vec::Vec">Vec</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u8.html">u8</a>>, <br> sprite_length: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u32.html">u32</a><br>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.unit.html">()</a>, <a class="struct" href="https://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html" title="struct alloc::boxed::Box">Box</a><dyn <a class="trait" href="https://doc.rust-lang.org/nightly/std/error/trait.Error.html" title="trait std::error::Error">Error</a>>></pre><div class="docblock"><p>Uploads a sprite sheet of textures to the GPU so they can be used by Fill::Texture and
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friends to paint shapes.</p>
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<p><code>path</code> - image file which is a grid of images.
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<code>sprite_length</code> - the width and height of an individual cell in the image grid</p>
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<p>The image file can have any number of sprites, but they must all be the same size.</p>
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<p>Once uploaded, textures are addressed by their id, starting from 1, from left to right, top to
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bottom, like so:</p>
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<p>┌─┬─┬─┐
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│1│2│3│
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├─┼─┼─┤
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│4│5│6│
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├─┼─┼─┤
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│7│8│9│
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└─┴─┴─┘</p>
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<p>Texture(0) is reserved for a pure white (no-op) texture.</p>
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<p>Implementation is based on the the description of ArrayTextures from:
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https://www.khronos.org/opengl/wiki/Array_Texture.</p>
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